Switch in C#

C# allows the use of switch statements similar to the example provided. Here is how you can write it idiomatically in C#:

Here’s a basic switch.

using System;

class Program
{
    static void Main()
    {
        int i = 2;
        Console.Write("Write {0} as ", i);
        switch (i)
        {
            case 1:
                Console.WriteLine("one");
                break;
            case 2:
                Console.WriteLine("two");
                break;
            case 3:
                Console.WriteLine("three");
                break;
        }

You can use commas to separate multiple expressions in the same case statement. We use the optional default case in this example as well.

        switch (DateTime.Now.DayOfWeek)
        {
            case DayOfWeek.Saturday:
            case DayOfWeek.Sunday:
                Console.WriteLine("It's the weekend");
                break;
            default:
                Console.WriteLine("It's a weekday");
                break;
        }

switch without an expression is an alternate way to express if/else logic. Here we also show how the case expressions can be non-constants.

        DateTime t = DateTime.Now;
        switch (true)
        {
            case var _ when t.Hour < 12:
                Console.WriteLine("It's before noon");
                break;
            default:
                Console.WriteLine("It's after noon");
                break;
        }
    }

A type switch compares types instead of values. You can use this to discover the type of an object. In this example, the variable t will have the type corresponding to its clause.

        void WhatAmI(object i)
        {
            switch (i)
            {
                case bool _:
                    Console.WriteLine("I'm a bool");
                    break;
                case int _:
                    Console.WriteLine("I'm an int");
                    break;
                default:
                    Console.WriteLine("Don't know type {0}", i.GetType());
                    break;
            }
        }

        WhatAmI(true);
        WhatAmI(1);
        WhatAmI("hey");
    }
}

When you run this C# code, it will produce the following output:

Write 2 as two
It's a weekday
It's after noon
I'm a bool
I'm an int
Don't know type System.String

Next example: Arrays.

If Else in C#

Arrays in C#

Learn X By Example

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Switch in C#